The elaborate alimentary canal of the higher animals develops ontogenetically from the same simple primitive gut of the gastrula.
It is both phylogenetically and ontogenetically an independent secondary formation, a later accession to the primary internal ear.
We have previously seen how this very rudimentary beginning of the skull in man is formed ontogenetically from the "head-plates," and thus the fore end of the chorda is enclosed in the base of the skull.
The former are phylogenetically and ontogenetically older than the latter.
This scale corresponds to the evolution of the sense of beauty in man, ontogenetically from the child to the adult, phylogenetically from the savage to the civilized man and the art critic.
In numerous instances muscles which have, phylogenetically, an undoubted epithelial origin, are ontogenetically derived from cells which ought to be classed as mesenchyme.
Ontogenetically there is a great variety of processes by which the passage from the segmented ovum to the two-layered or diploblastic condition is arrived at.
The simplest form among these latter is Acanthometron, which may be regarded both ontogenetically and phylogenetically as the common starting-point of all the Icosacantha.
Actissa thus represents both ontogenetically and phylogenetically the primitive condition of the Radiolarian organism, and may thus be regarded as the point of departure of all other forms.
The degeneration of organsontogenetically and phylogenetically has received a variety of explanations: 1.
It disappears most rapidly after the beginning of absolute disuse both ontogeneticallyand phylogenetically.
This is due to the fact that every human being is born with a highly differentiated brain, which gives him the possibility of attaining a rich mental function that he has neither acquired ontogenetically nor developed.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "ontogenetically" in a variety of sentences. We hope that you will now be able to make sentences using this word.
